Three-dimensional Analysis of Upper Arch Distalization with Mini-screw Anchorage

doi:10.13701/j.cnki.kqyxyj.2021.11.019

Abstract

Abstract: Objective: To measure the three-dimensional changes of the teeth after upper arch distalization with mini-screw anchorage using CBCT, and evaluate its movement mode and mechanical mechanism. Methods: 23 patients who underwent distalization of maxillary dentition with mini-screw anchorage were included. The three-dimensional changes of teeth were analyzed by Dolphin software. SPSS 23.0 was used for analysis of the changes. Results: The mean distalization values of upper first molar, canine, and incisor were 2.60 mm, 2.66 mm, and 2.07 mm. Mean distal tipping of upper first molar, canine, and incisor were 5.31°, 5.42° and -4.68°. The mean extrusion values of upper first molar and canine were 0.96 mm and 0.40 mm. The occlusal plane showed significant clockwise rotation by 1.51°. The upper first molar showed 4.57° buccal tipping and 7.71° distal rotation. The widths of upper canine and first molar increased 1.18 mm and 2.01 mm on average. Conclusion: Significant distalization of upper arch could be obtained by mini-screw anchorage.Upper molar showed a certain degree of extrusion, buccal tipping, and distal rotation. The occlusal plane showed significant clockwise rotation. The width of the upper canine and first molar increased.

Key words: CBCT, mini-screw anchorage, upper arch, distalization

CHEN Xiaobo, ZHENG Yaxin, ZHANG Junjie, HE Jie. Three-dimensional Analysis of Upper Arch Distalization with Mini-screw Anchorage[J]. Journal of Oral Science Research, 2021, 37(11): 1054-1058.

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